silvestri



Patented Aug. 23, I898. G. SILVESTRI. VALVE COOK FOR ROTARY MOTORS.

(Application filed Dec. 30, 1897.)

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No 609,562. Patented Aug. 23, I898. a. SILVESTRI.

VALVE COOK FOR ROTARY MOTORS.

(Application filed Dec. 30, 1897.) MOIIBL) 2 Sheets-Sheet 2.

NlTED STATES PATENT FFICE.

VALVE-COCK FOR ROTARY MOTORS.

SPECIFICATION forming part of Letters Patent No. 609,562, dated August 23, 1898.

Application filed December 30, 18 7. ser al No. 664,682. on model.)

To aZZ whom itmayconcern.

Be it known that I, GrULIo SILVESTRI, en-i gineer, a subject of the Emperor of'Austria I-Iungary, residing in the city of Vienna, in

' the Province of Lower Austria, in the Empire of Austria-I-Iungary, have invented certain new and useful Improvements in Distributing Valve-Cocks for Rotary Motors, of whichthe a plug mounted upon the motor-shaft and rowhereby the variations in the expansions are effected.

My invention is illustrated in the accompanying drawings in different sections and elevations.

I Figure 1 is a central section. .Fig. 2 is a cross-section on line H H of Fig. 1. Fig. 3 is .a cross-section of the complete valve-cock on line- H H of Fig. 1. Fig. 4 is an elevaiton; Fig. 5, an axial section; Fig. 6, a plan; Fig. 7, a bottom view. Fig. 8 is a cross-section of the expansion-mantle on line .2 z of Fig.

' 4. Fig. 9 illustrates the surface of the mantle in the developed state. Fig. 10 represents the relative location of the slots in the plug and of the recesses in the expansionmantle at the beginning of admission of steam for the rotation of the motor in the direction of the hand of a watch. Fig. 11 shows the same as Fig. 10 for the reversed rotation of the motor. Figs. 4. to 11 are drawn to a reduced scale as compared to Figs. 1 to 3.

1 The valve-cockis surrounded by a casing K. Theplug 76 above mentioned is fixed upon the motor-shaft and rotates within the casing simultaneously with the piston and with the same velocity. The plug is is provided with a circumferential groove or channel which communicates with an annular space k on the shaft 9 by means of symmetrical openings k 70 The space 70 extends nearly through the whole length of the plug 7a, so that the pressure medium entering through the short tube 6 passes through the annular groove 70 and openings 16 70 into the annular space 70 from where it is distributed through two diametrically-opposite slots 70 70 into the tubes 6 e and from there into the pipes connected with them. By means of the abovedescribed arrangement theplug. 7r, which constantly receives steam, is relieved from overpressure.

The plug his surrounded by an expansionmantle composed of parts M M The shape of these two parts is shown in Figs. 4 to 9.

The mantle-pieces consist of an annular portion 'MM having each two lapsm 'm m m The laps m m extend toward the circular mantle portion M and laps m m likewise extend toward the circular portion M. They are placed diametrically to each other in the cone-shaped mantle. The are of each lap corresponds in the drawings to a center angle of forty-five degrees, so that by the turning of the mantle portions M M toward each other there are formed either two open ings each of ninety degrees or four openings of together one hundred and eighty degrees in such a manner that two adjoining openings aggregate ninety degrees. The angles must not be exactly forty-five degrees. They may vary; but two opposite laps of one and the same mantle must have an equal length of the arc and equal center angles.-

One of the mantle-pieces M is provided with a slot m for the admission of steam. While the machine is in operation one mantle-piece M or M is always stationarily secured, the variations in the expansion being effected by turning the other mantlegpiece.

In Figs. 3 to 10 is. illustrated, as an example, the position of the expansion-mantle for the rotation in the direction of the hand of a watch. Accepted that the mantle-piece M is stationarily secured while the mantle-piece M of which only two laps m m are shown in Figs. 3 and 10, is adjusted for the desired expansion by any suitable device, the steam enters through the openings m m into the annular channel 70'. It passes then through the openings 70 70 into the annular space k and from there into the diametrically opposite slots 70 70". Accepted plug 70 occupies the position shown in Fig. and rotates in the direction of the hand of a watch, then steam enters the short pipes e 6 until the slots 70 70 pass the mantle-openings m m In this moment the closing of the steam-inlet commences, and is completed when the slots 70 70 are perfectly covered by the laps m m If the plug continues to rotate, then the slots 70 70 will arrive in front of the man tie-openings m m which then are filled with steam; but since this steam cannot enter the cylinder it does not interfere with the rotation of the motor. If the rotation is further continued yet, then the slots 70 70 will arrive in a retrogade succession in front of the steamchannels, admitting again steam to the cylinder a.

' I The slots k is, as well as the laps m m with the steam-channels m m and steam will pass from the plug for a longer period into the tubes 6 6 If the mantle-piece M Fig. 10, is turned so far in the direction of the hand of a watch that its laps m m bear against the laps m m of the mantle-piece M, then the highest degree of expansion is attained. The degree of expansion also depends upon the arcs described by the laps. The smaller the arcs of these laps are the larger is the relative dislocation of the mantle-pieces.

The reversion of the motor is effected in the following manner: The mantle-piece M is brought into the position shown in Fig. 11 and is secured there While the mantle-piece M is loosened and used now for varying the degree of expansion. As soon as the desired degree of expansion is attained then M also is secured. The mantle-piece M may further be turned so far that its laps m m close the openings for the admission of steam on the opposite side. If this is done, then mantlepiece M may be used for varying the degree of expansion.

The several phases during the reversed rotation of the motor are the same as described while the motor is rotating in the direction of the hand of a watch, and the turning and securing of the mantle-pieces may be effected in any suitable manner by a lever or by a governor.

Having thus described my invention, I claim 1. A valve-cock for rotary motors consisting of a plug 70 mounted stationarily upon the piston-shaft and rotating with the same and being provided with radial groove k and symmetrical openings 70 k an annular space k around the shaft, diametrically opposite slots 70 and tubes e,e in combination with an expansion-mantle composed of adjustable circular portions M, M provided with laps m, m, m 1% and slot for the admission of the driving medium,and steam-channels substantially as described.

2. In a valve-cock for rotary motors an expansion-mantle composed of adjustable circular portions M M provided with laps m, m, m m placed diametrically to each other in the mantle and extending toward each other, slots for the admission of the driving medium and steam-channels m m in the mantle, as specified.

In testimony whereof I have signed this specification in presence of two subscribing Witnesses.

GIULIO SILVESTRI. Witnesses:

HENRY O. CARPENTER, CHAS. E. CARPENTER. 

